# Polygons - Interior and Exterior Angles

- Author:
- Mr E. Bissoon

## Calculating angles in a regular polygon.

How to calculate an angle in a regular polygon is quite simple. Take a look at the graphic below to see how it's done:

n = number of sides in a regular polygon.
(A is the sum of all the interior angles inside a regular polygon.)

## The sum of exterior angles.

A simple rule: The sum of all exterior angles on a regular polygon is equal to 360
Another simple rule:
the measure of 1 exterior angle (where n = the number of sides in a regular polygon.

*or*n (where n = the number of sides in a regular polygon.